Alexban, I fly the NG. These incidents happened! So it doesnt matter whether it was following procedure, not following procedure or whatever that caused it. One has to ask, will it happen again and if so how can we prevent it. In the case of A/c & Press it has happened many many times. So lets either take the option away from the pilot altogether, he cannot be trusted 100%. (sorry girls and boys its true). Or design a Y2K+ system (not 1967) that is ergonomically and systemically foolproof. That would involve some push buttons perhaps, a better MCS maybe EICAM yes that would be nice to have in a 1999 airplane, why not. Is Boeing still retricted to the 25% changes to type rule when they went for original certification? I dont know, but surely an improvement in safety such as this is not hard to make. (expensive yes). Put it this way, if my family were on the Helios flight, I have enough evidence to take Boeing to the cleaners under a product liability suit! And I would.